Toggle press



March 12, 1935.

M. R. HATCH ET AL TOGGLE PRESS 3 Sheets-Sheet '1 Mum B8 18 I 30 1 33 17 Milli V 9 33/ A J 5/2 E38 50 5 4 7 55 l I. 38 34 35 x 45 35 35 I 11 9 9 5 .7 1 b 9/ 4 4 3 i I I 8 I W MW @35 W 5 0 March 12, 1935. M. R. HATCH ET AL TOGGLE PRESS March 12, 1935. M. R. HATCH El AL TOGGLE PRESS Filed Sept. 29, 1932 3 Sheets-Sheet 3 Patented Mar. 12, 1935 I 1,993,889

UNITED STATES PATENT oF lcE-T Mereehh R. Hatch as Arthur H. 'scmozyroieaa,

Ohio, assignors to The Toledo Machine & Tool Company, Toledo, Ohio, a corporation of Ohio Y Application-September 29, 1932 Serial No. 635,343 9 Claims. (01. 1134-38 This invention relates to toggle presses and has suspension is embodied in a double crank toggle for its object to provide driving connections from press. .f 7 I I 1 two parallel shafts to afforda'u'niform four point In a press of thisjtype, it is desirable to carry control of the slide or plunger in this type of out thesymmetry of'arrangement so that all press. This'is especially desirable in operations stresses incident to operation of one side of the 5 in which uneven or unsymmetrical distribution press remain on that side to be damped out if of the load may occur. The invention; in its p'ossiblebya corresponding stress on the opposite present embodiment, involves the use iof two side. ,For this reason it is found necessary to conparallel crankshafts operating in opposite direcnect a side of'the blank holderto the crankshaft l tions, each being driven at'both ends and. having on thesameside of the press, which of course duplicate toggle connections for application of involvesgreversing the motion ofthe driving elepower to the work. The shafts which drive the ments. Such an arrangementpossesses obvious twocrankshafts are geared together and symadvantages," but, to applicants" knowledge, has metrically arranged so that the torqueand stress never been satisfactorily accomplished. Eachwill normally be distributeduniformly and there crankshaft hasnear f its center a crank 23 15 is no tendency for one end or side to movein adwhich isconnected by a link 2a to one end of a vance of the other. The principal features of the bell crank 25 .journalled on a fixed central shaft invention are adaptable either to double action or 26, mounted" in a'well 10? secured in the casting triple action multiple crank presses. i 10. The other end of the bell crank 25 is con- 2 In the accompanying drawings, Fig. 1 is a front nected by a link' 2'? to an arm 28 mountedon a 20 elevation of a press constructed according to the shaft 29 in the casting 10 The arm 28'is coninvention, with parts broken away: nected by a link30 to. one end of a crank 31 Fig. 2 is a section taken on the line 22 of formed on the toggle shaft 32. The toggle shaft Fig. 1, and showing particularly the toggle mech- 32 is formed at each end with an arm 33 which is anism; 1 connected by a link or pitman 34 to a hanger 35 Fig. 3 is an end elevation of the press; which has ascrew threaded adjustable connec Fig. 4 is a plan View of the toggle mechanism. tion 36 with one of the four corners of the blank As illustrated in the drawings, the invention is holder 11. It will be seen that by disconnecting associated with a power press having a base 8 the links 30 fromthe cranks 31 and by removingv and side frame pieces 9 surmounted by an upper the pins which hold the cranks 23 and links 24 3O casting 10. Within this frame a blankholder 11 together, theentire internal blank holder operanda plunger 12 are guided for vertical recipro-f ating mechanism may be removed as a unit with C y movement- The mechanism f Operating the'well 10 The advantage of this in a very h press is d v n by a m r 13 pp r n a large press, will be appreciated, as it is possible seat 14 secured to the rear sideof the frame 9 and t s e ble the mechanism on the floor and then 35 having a Suitable i i Connection, a diposition it inthe press as a unit by means of a cated at 15, With the main. drive 311311116 which cranelowering' all. of it through the top of the is mounted in the pp sting 10. press. It is therefore unnecessary to position and TWO parallel colmtel'shafts mounted n connectje'ach element'individually within the conthe casting 10 in front of the shaft 16 and'have fined area of th press; H intermeshing gears 13 Secured h one of Each connection to the plunger is from a crank 1 the gears 13 meshes h a pinion 19 Secured to 3'7 through. a pitman 38 having an extension 39 i the shaft 16, so that both Shafts are which has a threaded shank 40 with a head 41 formly. parallel Crankshaftszo are mounted thereon and seated in the slide for ad- 1 mountedin the upper finds of the frame pieces justing the latter up ordown. .The heads 41 on 9 beneath F Fespective Shafts #2 h all of the threaded shanks 40 are rotated simulcrankshaft 1s drlven at each end by a pinion 21 taneouslyfhd al byalmotor 42 the drive to and gear 22, secured to the countershaft 1'7 and each h q being through Spur gearing 43, Worm crankshaft 20 respectively gearing 44 and bevel gearing 45.

TWO toggle Shafts are mounted in the Casting In the operation of the press, the two shafts 17 10. There are two connections from each crankare d i simultaneously from th main drive shaft 20 to the plunger and two connections from shaft 16 The t crankshaft-,5 20 are driven each toggle shaft 32 to the blank holder, making from both ends simultaneously and equally in in all four sets of connections, symmetrically aropposite directions, and the cranks 23 are in balranged. Thus, the principle of the four point anced relation between the planes in which the 55 pitmans 34 move. Each crank 23, through the toggle connections above described, is connected to two corners of the blank holder 11 at one side thereof, and each crank 37 through the connection 38 is connected to one of the four corners of the plunger 12. Thus, there are in all four connections to the blank holder and four connections to the plunger and the forces'are symmetrically distributed.

We wish it understood that our invention is not limited to any specific construction, arrangement or form of the parts, as it is capable of numerous modifications and changes without departing from the spirit of the claims.

What we claim is:

1. In a power press, the combination of a frame including a base, side pieces and an upper casting secured rigidly in assembled relation, 21.

well removably secured centrally of said upper casting, a work engaging member, two crank.- shafts driven in opposite directions, and connections individual to the respective crankshafts and mounted in said Well and, having parts removable therewith and transmitting power from the crankshafts to said work engaging member.

2. In 7 a power press, the, combination of a frame including a base, side pieces and an upper casting secured, rigidly in assembled relation, a well removably secured centrally of said upper casting, a blank holder and a plunger mounted in said frame, a power shaft, two central crank! shafts mounted in said side pieces and driven in opposite directions at bothgends by said power shaft, separate toggle connections having parts mounted in said well and removable therewith and connecting each crankshaft to both ends of said blank holder, and conne'ct'ions'between each crankshaft and each end of the plunger, whereby power is delivered to all four corners of the blank holder andthe slide. v

3. In a power press, a pair of parallel crankshafts driven in unison in opposite directions, a plunger, cranks on each of the crankshafts c0nnected to two points of the plunger, asecond crank on each of said crankshafts disposed between the cranks connected to the plunger, 2. blank holder, a pair of toggle shafts. connected to said blank holder, and separate means including a toggle and lever mechanism to operate each, of said toggle shafts from the second crank more closely adjacent thereto.

4. In a power press, a pair'of crankshafts' driven in unison in opposite directions, each crankshaft having three cranks, a plunger, pitmans connecting four points on said plunger to two. cranks on each crankshaft, a blank holder, a pair of toggle shafts parallel tosaid crankshafts one on each side of the press, toggle joints, connecting said blank holder and each of said toggle shafts, and separate means to operate each of' said toggle shafts from the crankshaft on the same side of the press, said means including a plurality of toggles.

5. In a power press, a frame, a plunger and a blank holder each mounted for reciprocating movements in said frame, two parallel crankshafts driven in unison and in opposite directions, one at each side of the vertical center line of the frame, connections between each crankshaft and said plunger whereby to reciprocate the latter from rotation of the shafts, and separate operating connections between each crankshaft and the adjacent side of the blank holder whereby to impart predetermined reciprocatory movements to said blank holder, said means including at least two to gle sets.

6. In a power press, a frame, a plunger and a blank holder each mounted for reciprocating movements in said frame, two parallel crankshafts driven in unison and in opposite directions, connections between each crankshaft and said plunger whereby to reciprocate the latter from rotation of the shafts, and independent operating connections between each crankshaft and the portion ofthe blank holder on the same side of the press as the crankshaft, each of said latter connections comprising a toggle joint and a member pivoted in the frame on a common shaft.

'7'. In a power press, a frame, a member removremoved from said frame as a unit with said 2..

member. 7

8. In a power press, a frame, a member removably mounted in said frame forming a well, a plunger and a blank holder mounted for reciprocating movements in said frame, two parallel x crankshafts driven in, unison and in opposite directions, operating connections between each crankshaft and said plunger, a pair of toggle shafts journalled in said frame parallel to said crankshafts, connections between said toggle shafts and said blank holder, and independent means to, operate each of said toggle shafts from the crankshaft on the same side of the press, said means including levers having a common fulcrum in said, well whereby part of said means is removable from the frame as a unit with said mem her.

9. Inca power press, a frame, a member removably mounted in said frame forming a well, a plunger and a blank holder mounted for reciprocating movements in said frame,'two parallel crankshafts, connections between each of said crankshafts and said plunger, a pair of toggle shafts parallel to said crankshafts, one on each side of the. press, connections between said toggle shafts and said blank holder, and independent means, to drive the respective toggle shafts from the crankshaft adjacent thereto, each of said means including a link and a bell crank lever, both of said bell crank levers being pivoted on a common shaft in said well member.

MEREDITH R. HATCH. ARTHUR H. SCHLOZ.

GERTEMEATE (2F GQRREGTEQN.

Patent Ne. 1,993,839. Marcia i2, i935.

- MEREDETH R. HATCH, ET AL It is hereby cei'iiiieei that aims aggears iii the printed speciiicsiiien of the aimve numbered pal-mi requiring aerremiim as iaiiaws; ?age 2, iiiSt ceiixmn, line 40, claim 2-, i0; "siiiie" mad piiiiige and that the said Letters Patent sheuid be read with this mrremioii Remain that the same may conisrm in the i a Signed and s-eaied this 11 day @i April, A. D 13 35.

Leslie Frazer (Seal) Acting IOSEEHiiSSiOKEQF of finents. 

